Update README.md

Author: MelissaGraham

README.md

@@ -7,11 +7,11 @@ These notebooks have drawn from these repositories:
 
 <br>
 
-| Number | Title  | Description  |
-|---|---|---|
-| 01 | Intro to DP0 Notebooks | How to use a python notebook, query a DC2 catalog, and retrieve a DC2 image. |
-| 02 | Intro to TAP | How to discover, query, and retrieve DC2 catalog data with the Table Access Protocol (TAP) service. |
-| 03 | Intro to AFW Display | How to display, manipulate, and overlay data onto DC2 images. |
-| 04 | Intro to Butler | How to discover, query, and retrieve DC2 images with the Generation 3 Butler. |
+| Title  | Description  |
+|---|---|
+| 01. Intro to DP0 Notebooks | How to use a python notebook, query a DC2 catalog, and retrieve a DC2 image. |
+| 02. Intro to TAP | How to discover, query, and retrieve DC2 catalog data with the Table Access Protocol (TAP) service. |
+| 03. Intro to AFW Display | How to display, manipulate, and overlay data onto DC2 images. |
+| 04. Intro to Butler | How to discover, query, and retrieve DC2 images with the Generation 3 Butler. |
 
 More DP0 documentation can be found at dp0-1.lsst.io.